Sound-producing device of the telephone-receiver type



=N. BALDWIN SOUND PRODUCING DEVICE OF THE TELEPHONE' RECEIVER TYPE Ap 2G 9 .1926,

Filed June 14, 1922 WiTNEEfiEB NVENTOR I 'vices of the Telephone-ReceiverType, ogfj;

which the 'following is a description,' refcr- Paten'tecl Apr. 20, 1926.

"UNITED. STAT NATHANIEL BALD IN, or ILL cases, UTAH.

, SOUND-PRODUCING DEVIGEQF TELE PHONE-RECEIVERTYPE.

. Application filed June 14, 1922. Serial No. 568,163.-

T0 allwkom it may concern; I

Be it known that I. NATHANIEL BannwIN, a citizen of the United States, residing at Mill Creek. in the county of Salt Lake and State of Utah, have invented new lIl (l' ll$0- ful Improvements in Sound-Producing De= ence being had to the accompanying drawings and" to theletters and figures ofret erence marked thereon.

.The invention relates to he more particularly to certain improvements in: my prior Patent .No. 1,153,593, issued September 14, 1915.

'One object of the invention is to secure a more sensitive sound producing instrument. bythe employment of a relatively smaller: diaphragm. .Anotherzolnect is' to secureai extended air chamber between the diaphragmand the supporting base frame. Another object is to secure convenience of construction receiver.

These and o therobjects are attained .by

employing :1.;se:it collar, which is: supported Figure 'l'is a topplanjo whichsupports the diaphragm Upon i iier flange.

I p The accompanyi drawings more fully explains this invention.

fthe seat. collar. Figure 2 is across section 'of the seat. col

lar. "Figure 3 is a metricalsection of'a.

, Watch. case form showing the seat collar in position Fi ire his 'a vertical viewv of a funnel-shape receiver, partlyto'rn away,"

showing the seat, collar in position.

- In the Figures? and .4 the seat collar 1 the diaphragm 3. Cup 2 is in turn seated on the rim of the enclosing casing. The chain ber between the diaphragm 3 and the'bas'e;

while assembling the partsof the I f ra me binding post 4 may be easily reached before the diaphragm. 3 is fastened down 'which' is an advantage.

Letters Patent on is as follows iug easing containing; an electromagnet; 'a'

position relative to the said n' agi'iet and pro- 'vi'ded with a c rcular depressed ledge formed in a central ott'set portion of said collar and is extendedoutwardly, under the seat"collar. \Vliile assembling theparts,

' :seating collar"mounted in said casing inw and useful- .iinproveincn ts m teleplione-receivcrs, and.

, that I claim as new and desire lo securc concentrically surrounding a central aperledge and eover'ingthe aperture. .t 2. A telephonereceiver having a casing containing an eleetroma-gnet, a movable a r i'i' ature for said eleetromagnet, means bias-' tin-c therein. and a diaphragm seated on sai a' seating collar mounted insaid casingin position relative -to thefsaid magnet and armature. and provided with an aperture .phi agm seated in said aperture and on said edge. and means to: connect said armature ,andsaiddiap'hi'agm, said means serving to transmit movements'therebetween and 'to retain said diaphragm in said aperture.

3. ."I11 -a. telephone receiver, an enclosing mg said armature toward one end position,.

- having-an inwardlyprojecting ledge, a die casing having an internal seat, a diaphragm of diameter substantially less than the diameter of the -casing.- aseatingcollar hav- .80 ing a peripheral edge to. be receivedi'nsaid seat and a central thicker. portion. to hold saidfco'llar centered with regard to said cas- "ing, and acircular offset fledge surrounding acentral aperture and adapted to receive and hold the diaphragm with one of its sur-" is provided at the. outer face of sai' diaphragm.

faces -substantially flu-sh'with the inward surface o'tthe collar,'whereby anair. ocket "NATH IEL BALDWIN; 

